Dynamical mean field theory for manganites

TL;DR

This paper applies dynamical mean field theory to model manganites, incorporating multiple interactions to accurately describe their electronic, magnetic, and structural properties, including insulating behavior and dynamical phenomena.

Contribution

It provides a comprehensive parameter estimation and a detailed DMFT solution that captures the complex physics of manganites, including their insulating and paramagnetic states.

Findings

Accurate one-electron spectrum and optical conductivity results.

Reproduction of insulating parent and doped manganite states.

Highlighting the importance of all interactions for realistic modeling.

Abstract

Doped and undoped manganites are modeled by the coupling between itinerant $e_g$ electrons and static $t_{2g}$ spins, the Jahn-Teller and breathing phonon modes, and the Coulomb interaction. We provide for a careful estimate of all parameters and solve the corresponding Hamiltonian by dynamical mean field theory. Our results for the one-electron spectrum, the optical conductivity, the dynamic and static lattice distortion, as well as the Curie temperature show the importance of all of the above ingredients for a realistic calculation as well as for describing the unusual dynamical properties of manganites including the insulating parent compound and the insulating-like paramagnetic state of doped manganites.